Frequent testicular pain during sex may be caused by enlarged prostate, orchitis, tumors, nodules, trauma and other reasons. 1. Enlarged prostate: frequent sexual intercourse can easily cause congestion of the genitourinary system, which can cause prostatitis, prostatic hyperplasia and other complications can cause enlarged prostate, which may cause nerve pulling pain, leading to symptoms of hidden pain in the testicles. 2. Testicular inflammation: frequent sexual intercourse may cause testicular infection, causing testicular inflammation, which may also cause hidden testicular pain. 3. Testicular tumors, nodules: various causes of benign tumors of the testicles malignant tumors or testicular epididymis, the ending will also cause frequent sex testicular pain. 4. Testicular trauma: frequent and intense sex may lead to testicular trauma from external blows, which may lead to hidden pain. If the above symptoms, it is recommended to suspend sex first, observe whether there is any improvement, if the testicles continue to pain may have other reasons, need to go to the hospital in time to check, clear cause of treatment as prescribed by the doctor.